Adjustable gauge



Dec. 18,1923.

J. BATH ADJUSTABLE GAUGE Filed Aug,

'tra i l rangen :form BATH, or wononsrnn, Massacnfusnrrs, Assrenon To JoiN :BATH a co. INC.,

OF WORCESTER, MASSACHUSETTS, A CORPORATION F MASSAGEVU'STTVCIS.

^ Application vfiled August 10, 1920i lSerial No. 402,608.

To all who/m, t may concern Be it known that I, JOHN BATH. acitizen of the United States, residing at Worcester, inthe county of Worcester and State of llassachusetts', have invented a new and useful'Adjustable Gauge, of which thel lollowing :is a speciiication.'

This invention relates to improvements inl anadjnsta-ble guage of the type shown in the prior application of Bath and Gray, Serial No. 300,053., tiled May th. `1919.

Such gauges are particularly vdesigned for making accurate measurements of' internal diameters, although they-may'aso serve other useful purposes.. lt is the general object of my present invention to improve'the details of construction of such adjustable gauges and to thereby render the tool better adapted for the purposes for which it is designed.

lilith this object in view, my invention includes the following important features,

. namely g an improved device for locking the gauge to preserve 'the gauge reading or ad justment, so designed that Wear of the parts l will he materially reduced; means to adjust the gauge with a uniform yielding tension; improved devlces Afor taking up lost motlou or back lash in the thread of the shait; 1m-

provements in the devices for taking up longitudinal play of sa id shaft; 'and an improved and simplified size-indicating device, independent of the gauge bars.

My invention further relates to other arrangements and combinations of parts which will he hereinafter. desrrilnxd and more particularly pointed out in the appeuded claims. A preferred form of my invention is-shown in the drawings, in which l v Fig. l is a plan view ol' my improved gauge;

Fig. 2 is a horizontal sectional view thereof;

Figs'. 3, 4 and are transverse sectional views taken along the lines .L-3, 4*'4 and 5--5 in Fig. 2;

Fig. (i is a partial sectional view 'taken along the line @w in Fig. 2; and

.Fig` 7 ,isl a detail view ofla washer to be described. f

Referringto the drawings, it will be seen' that the gauge 1s 0f the general type dis- 'I closed ina the prior application previously noted and comprises a body creasing. 10, a threaded shaft 11, and a member 12 threaded on said shaft and movable longitudi.-

nally therebyv relative to the. body 10. The

member -12 is provided with a numbeil of inciined dove-tailed guide-.ways,13,74 (Fig. 3),

in vwhich gauge bars 14'are slidably mounted: The bars 14 are of corresponding dovet'ailed cross section and are provided'with vinclined inner faces, as clearly shown in Fig. 2.

I Une or more bars 14 is radially slotted at its ends to recive a key'or pin 15 mounted in theilange 16 ofthe body 10, and an 'additional key or pin 17 mounted in a flanged oolar 18. Angular displacement of the member -1.2v and bars 14'relative to the body l() is thus prevented.

` Tl1e collar 18 has a portion 19 extending into a recess 20 in the end of the `vmember 12. A threaded extension 21 of the Shaft liextends Jfreely through the port-ion 19 of the collar 18 and supports a binding nut 22,.a washer 23 and a lock nut 24'. The nut 22 has an external bearing in a recess of the collar 18 and the nut. 24 is similarly posiwasher 23 is slidable on the portion- 21 of the threaded shaft, but isheld from rotation by a lug 25 (Fig. 7) extending into a key-way 2G in the portion 21 of the threaded shaft.

tioned in a recess of the nut 22.y The Lses The shaft l1 is provided with a shoulder*- l 27 against which a hardened steel co1lar128 is seated` said collar forming athrust bearing against a shoulder l29 formed on the inside of the body 1Q. All end play of the threaded shaft '11 is taken up by means of lthe nuts 22 and 24 which draw' the collar 2S lirmly against the shoulder 29 on the body 10, and at the same time dirawthe collar 18 against the ends of the gauge bars 14, hold' the. latter `a,: ;ainst the flange 16 of the bo y 1Q.

gl'fgs'ite end of the bodylO and cooperates with When the parts are thus adjusted as desired, the opening in the end of the collar 18 may be closed by a disc 30, tlneaded in the end of the collar. This disc efi'cctually protects the parts within from dirt and injury. A nut 3l (Figs. 2 and 3') is threaded into a recess in themember 1.2 and is also threaded oii'to the shaft 11. By slightly adjustingvthe nut 31 angularly, all wear and lost lmotion between the shaft 11 and member 12 maybe taken up. For the purpose of suchr angular adjustment, I provide worm gear teeth 32 on the outside of the nut 31, engagedby a worm 33 mounted in bearings extending transversely of the body 12. The f worm is provided with a slotted head 3.4 by lwhich it may be adjusted and with a slotted nut A35 at the other end for holding the z'adjustment. Wear of the parts may thus taken up without 4disturbing the endwise adjustment'of the/shaft 11. l

Improved devices are provided for iny auge diameter. These devices zfinclude a sca e 36,. (Fig. 1)l on the body 10, ,'oopera-tingwith an index or lzero line on Vfa rod- 37 adjustably secured in a recess 38 ,'(FigJ2) in the member 12 by a set screw 39Lff'l`he rod also extends into a recess 1n ,0 the body l0, a portion of one side of which i is cut away as shown in Fig. 1 so that the zero line may I befread in connection with thescale 36.

A second zero line is Placed at the Oppo' la graduated ring 40 mounted to rotate with theshaft v11. The ring is connected to the `shaft through aserrated collar 41, fixed in position'on the shaft by a taper pointed, set

40` `screw 42.'. l By looseningthe set screw, the

" collar 41 may be slipped outward so that the y ringj'40 may-.be adjusted angularly to .the

. extent. f one yor'more teeth, bringing the' zero' line toindicate the correct scale read- 45. ing when the lgauge bars are set to a nredetermined standard size.

- A. substantially similar graduated ring constructionis described .and claimed in my l.".prior,application Serial No. 351,686, filed 50 fJanuzi ry15, 1920, but the provision of the slidingvrodf? is novel in this'application andl consider the same to constitute an imi" j .portant improvement.

It is often desirable vto lockthe gauge` .5 5` after adjustment, and for this' purpose, .I

provide binding plugs 43 (Fig. 2) mounted in aA transversely extending or radial recess i 144, the shaft 11. At their outer ends, the

. Pplugsengage the innersurface of the body 50, 10, and at their inner ends they are grooved yfor engagement by the conical point of a plunger 45, slidahle. in a recess 46 in the shaft 11.- Pins (Fig. 4) preventsdis.v

I placement of the plugs 43 angularly and, s,

. slip by ifirmsai.A

stud or screw y48 (Fig. 2) similarly prevents rotation of the plunger 45.

The outer end of the plunger is threaded to fit within a correspondingly threaded recess 49 in an actuating member 50, rotatably mounted in the reces-s 46 of the shaft 11. The member 50 is circumferentially grooved at 51 (Figs. 2 and 6) to receive a block or vshoe 52 which may be fixed in position by a stud or screw 53 in the shaft 11.

. ',lhe parts are assembled by placing thev shoe in the groove of the actuating member and sliding these -parts into the recess 46 before the screw 53 is inserted. The shoe 52 .thereafter receives the end thrustl of the actuating member; and prevents axial Inovemounted upon the end ofthe shaft 11, and

having teeth 55 enga-ged by one or more spring' plungers 56 mounted for longitudinal movement in the collar 41 previously described.

The ring 54 is positioned longitudinally .on the shaft 11 by a pair of blocks or shoes 57 loosely secured to the ends of adjusting screws, A groove 59 for the shoes lis. formed on the inside of the collar 54 and a corresponding groove is formed on the outside of the shaft 11.

In assembling the parts, the screws 58 are turned outward, drawing the blocks, 57 into the groove 59 as shown in the upper part of Figs. 2 and 5, After the ring is placed in position on the shaft 11, the screws are turned inward, seating the blocks in the groove 60 of the shaft 11 as shown in the lower part y of the same figures.

W hen the parts are thus assembled, the shaft 1l may'then be rturned by grasping the ring 54, the serrated teeth of which will `the plunger 56 when a certain resistance is encountered by the bars 14. The teeth 55' extend under the flange ofA the collar 414 and the vparts are thus efectually shie-lded from dirtl or injury.

The operation and use of my improved gauge will be understood from the preceding description. As the shaft 11 is turned relatively to the body 10, the member 12 yis moved longitudinally with a. sliding motion relative to the gauge bars 14, which 'are thereby. movedradially inward or outward in: accordance with the direction of rotatonpf the shaft 11..`

an inch and fractions of one ten-thousandtlis ma bef` readily estimated",

`guitable oil passage 62, 63 and 64 are provided Within the shaftv 1l and-member l2,

l and the recess 46 in the shaft lla-may be mounted in said member and gear, and means whereby said worin may bey utilized as an oil chamber from, which the Working parts may be easilytlubricated,

Having thus' described my invention, it

will beevident that `changes and modifications'can be vmade therein, by those skilled in the art, within the spirit and/scope of. my inver tion as Set forth in the'claims, and I ,do not 4Wish v:to be otherwise .limited -to the details herein disclosed, but what I claim,is: i'

1. vAn adjustable gauge comprisinga body, a threaded shaft mounted for rotationonly therein, a member threaded thereomand provided with bearing surfaces inclined to the axis 'of said shaft, a plurality of gauge bars having. portions contacting with Asaid 'im clined surfaces slidably. lmounted. insaid,A

simultaneously radi-v member and movable ally thereby, a. nut threaded in said-member and also threaded on said shaft, and means accessible from the side of said membeiifor adjusting said nut. y

'2. An adjustable gauge comprising a body,

a threaded shaft mounted for rotation only I t .cli'ned surfaces. slidably mounted `in sa'id therein, a. member threaded thereon. and provided with bearing surfaces inclined to the axis of said shaftya plurality of' gauge bars having portions 'contacting'Withsaid inclined surfaces slidably n'ioiu'ited iii said member and moral-ile simultaneously radially thereby, a nut threaded in said member and also threaded on said shaft and having worm gear teeth formed tnereon, ya Worin engaging said turned to adjust said nut.

3. ,In an adjustable gauge, in combination, a body. a' threaded shaft mounted, forrotation only therein, a member threadedfon Said shaft and provided with bearing. surfaces 'inclined to the axis of said shaft, a plurality of gauge bars having portions Contact@ ing with said inclined surfaces slidably mounted in said member and movable simultaneously radially thereby, a recessed flanged collar rotatable preventing longitudinal'movement of said bars relative to said ybody,'apair of bind-A be preserved by turning .thev

body l0. .The v gauge maybe 'having a longitudinal 'said body, said recess being on one side and said rod and, body having with bea-ring relative to said shaft and l ing nuts for saidv collar tlireaded on said vsha-ft and disposed in the recess of said collar, and a Washer positioned between said nuts and held from rotation relativeto said shaft. y

4. lIn an adjustable gauge, in combination, a `bodya threaded shaft mounted for rotation only therein, .a member lthreaded on said shaft and provided with bearing surfaces inclined to the axis of said shaft, a plurality of gauge bars having portions contacting with said inclined surfaces slidably mounted in saidmember and movable simultaneously radially thereby, a recessed flanged collarrotatable on sa'd shaft and preventing longitudinal movement of said bars rela-tive to said body, means disposed in the recess vof said collar to position said collar on said shaftand in said collar and sealing'the outer end of ythe, recess therein. i

' 5. An adjustable gauge comprising a body, athreaded shaft mounted for rotaton only therein, provided with bearing surfaces inclined to the axis of said shaft, a plurality of gauge bars having portions contacting with said incl`ned surfaces slidably mounted in said member and movable simultaneously radially thereby, and an indicating device mov- Iable longitudinally with said member, 'said indcating device and body having cooperatf 6. An adjustable gauge comprising a body recess, a threaded shaft mounted for rotation 1n said body, a

member threaded on said shaft and provided 'with bearing surfaces inclined to the axis 'of said shaft` a plurality of gauge bars having portions contactingwith said inineinber and movable simultaneously radially there-by, and a rod fixed to said member and movable longitudinally .in the recess 1n partially open (fo-operating graduatifms to'indicate gauge diameter.

7. An adjustable., gauge f' comprisinga b ody, a. threaded shaft mountedfor rota- -t-ion only therein, a member Vthreaded on said shaft and having a longitudinal recess on said shaft, said member being provided surfaces inclined to the axis' of said sha ftiind having a longitudinal recess. a plurality pf tact-ing with said inclined surface, slidably mounted in said Vmember and -movable simultaneously radially mounted in. the recess in said member. and adjustable longitudinally therein, and means lto vhold said red adjusted position, said rod and body having' cooperating graduations to indicate gauge dia-meter.,

a disc threaded a member threaded thereon and.

gaugeJ bars having portions, coning graduations indicating gauge diameter. I

movable with said tion only therein,

`of gauge bars' having ing. a spring pli'inger mounte 8. An adjustable gauge comprising a body having -a. longitudinal recess, a threaded shaft mounted for rotation only therein, va member threaded on said shaft and ,provided 1 with bearing surfaces inn clined to the axis of said shaft, a plurality of gauge bars having portions contacting with said inclined surfaces slidably mouhted in said member and movable simultaneously radially thereby. and an indicating device member and extending into the recess in said body, said device and body having cooperating graduations indicating gauge diameter, and said recess be-. ing partially open to permit reading thereof.

9. An adjustable gauge comprising a body, a threaded shaft mounted for rotaa member threaded thereon and provided with bearing surfacesinclined to the aXis of said shaft, a plurality portions contacting with said inclined surfaces slidably mounted in said member and movable simultaneous'- ly `radially thereby, and a sleeve by whichs said shaft may Abe turned, said shaft hav- I d in fixed-relation thereto, and said sleeve being fixed longitudinally of said shaft and having teeth on` one side thereof positioned for engagement by said plunger.

l0. An adjustable gauge comprising a body, a. vthreaded shaft mounted; for rotationv only therein, a member threaded thereon andprovided with bearing surfaces inclined to the axisof said shaft, a plurality of gauge bars having portions contacting with. said inclfned surfaces slidably mountedv in said member andmovablesimultaneously radially thereby, a collar fixed to said shaft and recessed at one end, a sleeve loose on said shaft and having serrated teeth extending into the recess of said collar, and a device mounted in said collar and -yieldingly enga-ging said teeth whereby said shaft may be turnedfwith a pre-determined tension.

11. An adjustable gauge comprising a body, a threaded shaft mounted for rotation Aonly therein, a member threaded thereon an-d provided with bearings surfaces inclined to the axis of said shaft, a plurality of gauge bars having portions'contacting with said inclined surfaces slidably mounted in said member and movable simultaneously radially thereby, a sleeve by which said shaft may be turned, a. yielding connection be, tween said shaftand said sleeve, and means to hold said sleeve in fixed longitudinal posif 12, An adjustable gauge comprising a body, a threaded shaft mounted for rot-ation only therein, a` member threaded thereon and provided with bearing surfaces inclined tothe axis of said shaft, a plurality of gauge bars having portions contacting tion only therein,

with saidinclined surfaces slidably mounted in said member and movable simu taneousl radially thereby, a sleeve by-Which said sha may be turned, a yielding connection between said shaft and said sleeve, and means on said-collar ttinga groove in said ,shaft to position said sleeve longitudinally. '/1

13. An adjustablefgauge comprising a body, a threaded .shaft Amounted for rotaa member threaded there.- on and provided lWith vbearing surfaces 'in clined to Ithe axis of said" shaft, ^al plurality of gauge bars ing with said, inc-lined. surfaces slidably mounted on said memberl and movable simultaneously radially thereby,l binding plugs mounted to slide in, `a radial recess in said shaft, a plungermounted for longitudinal movement only in said shaft and having w'edging engagement with. r4'said plugs, and means to move said plunger.

14. An adjustable gauge comprising ,a body, a' threaded shaft mounted for rotation .only therein, a member threaded thereon and' providedwvith bearing surfaces inclined to the axis of said shaft, a plurality of ,gauge bars having portions contacting with Said in said member and movabl l radially4v thereby, binding pp slide in av radial recess threaded plunger ugs mounted to in said shaft, a

having portions contactinclined surfaces slidably mountedsimultaneously mounted for longitudinal movement only in said shaft, and an with said inclined surfaces slidably mounted inesaid member and movable simultaneously radially thereby, binding plugs mounted to slide in a radial recessl in said shaft, a plunger mounted for longitudinal movement only in said shaft, an .actuating member rotatable in said shaft and haring a circumferential groovepand a block` fixed tosaid shaft and positioned in said groove, said actuating member .Y having threaded: engagement with saidplungergand beingr effective binding,

through said plunger to move said plugs radially. V j i 16. An adjustable gauge comprising a body, a threaded sha-ft mounted for rotation only therein, a member threaded ."tliereon vand provided with f bearing surfaces inclined to the axis of said shaft, a4 plurality of gauge bars'having portions contacting with said inclined surfaces sldably mounted in said member and movable simultaneously radially thereby, e, nutthreaded in said member and also threaded on said shaft, and means for adjustingand holding Said nut. v

-l?. An adjustable gauge comprising e body, a threaded shaft mounted `for rotation only therein, a member threaded thereon and provided with bearin surfaces in if? cined te the axis of said sha t, a, pluralityy member and movable simuntaneously radial-l v1y thereby,v and cooperating elements for indicating gauge diameter, Said elements bef ing associated with said memberand Said body respectively.

In teetimonyu whereof l'. have hereunto aixed my signature.

JOHN BATH.

iusl 

